<wicket:head>
    <style type="text/css">
        div.node-picker table.imxt-body tr.disabled {
            font-style: italic;
            color: gray;
        }

        div.node-picker table.imxt-body tr.disabled td.imxt-select {
            font-style: normal;
        }

    </style>
</wicket:head>
<wicket:panel>
    <div wicket:id="grid" class="node-picker">
    </div>
</wicket:panel>